Breaking Bad has had plenty of creatively gruesome violence crammed into its six-year run. But there are some acts deemed too psychotically vicious even for Walter White and his associates. According to EW:
In one of Gilligan's early ideas, a drug kingpin (nicknamed Keyser Söze) has one of his henchmen escorted behind, say, a Home Depot. And then things get ugly. "He takes a chisel and says, 'Pick a number between 1 and whatever,' and that's the vertebrae that he chooses to bang the chisel in and paralyze the guy," says [executive story editor Gennifer Hutchinson]. "We loved this idea. It was so gross."
It is pretty gross! Eventually the drug kingpin character became the infamous Gus Fring, who the writers decided was frightening enough with just a regular old box cutter. All together now: gaaaaaah.